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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9336f84d4afecfb77f8228974596976a93d8783f342ee9da1a96a2b62bc3fa' 
  AND token = '9qffIAWnwO23SRPH4WE1L0Gks40hzvWk/i7tFkBRj74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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