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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587f966ff77d918a5d5fbeb27693d8f9bca46f5b2ddb2cbb67e2f971b0cb4f8b' 
  AND token = 'nkajZTsk396fgUOvg+wLuFZmSIT1vKb53ZgqCTQjGSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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