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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d86fb83e639b803b41edff47c674d20b7838e3660ea1178116703a3a0a26fbd' 
  AND token = 'xLVuO+v2mI3B7GcABKXcbtJPMzYZgUt3QFbCPzf3MMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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