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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec7e971c466de2fd6a69e851fe6d36af4f617abf4265fcf7b35a9649408dfee' 
  AND token = '2KE76N5iaTzb1WsjZtbOsFPRp8d/KMoTIyhrUV799WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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