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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3773fd2d2c63d272cb3bd5a394292d055e808155b3b9637160d4b965ccb8f11d' 
  AND token = 'G4FF/H0giSN6yxEognNOF0BkLkglMBQd17Qhksz+D2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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