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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4531cec01f98e940035fbc45848811389dc6e3e1a9d536331fcb58a06cf7896' 
  AND token = 'ap2fAA78atgniOMlWjuWtBtzuAJfJETm8j5iNDQw3Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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