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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3025fe0b7f90403840941f347610d9d8aa537d45a97a59465b24f4820ccdc1e5' 
  AND token = 'tUDpOyV9maRh+Dl2NhpwjAcodi8lZkAt1UIdFIS/hoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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