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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b947ca304a8891ca97088b22b6d115687ffdd1dc887b78b9be3f019126c4de3' 
  AND token = 'lfmQEHiQD2R+JydTBhI5qy16OV7yWeFHtpLlQn/uOJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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