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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0221d53a4d3d2ecb66273cae42e514786f8def63c991c18ca31b13c04a478b6a' 
  AND token = 'csvGfRmFuf0qKH0kBhtGVnuTri6WnO2vRzQTevLdeag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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