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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d31ed9fcfffdc63c0fc382514dbeed80df263232f0579ee2d1bc88104a956a' 
  AND token = 'BBBxk7pB0yON/c0v6NU+hXhUmIITxi+2XJdNhkUKpPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}