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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7c5231b16e63befbd5bc02e23bb893ae662f8540735e00510cf79d93a357fd' 
  AND token = 'WFlyBR0CIoE1FM6xTTBrbP5mPvTojUy+JaJBgTXux5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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