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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61697adb17130a926ef9ee739f1a411de9c1775e25ce9b8f15b3b708379131cc' 
  AND token = '9OEYLqF8oeuOzZ2eKIaHlZUg32JHaqSXUW1uoi17jBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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