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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a1a4a2c180d5de4a50cda39a48527b8dc02aa77219630ea005999955b825d5' 
  AND token = 'pAKitKDiP+2z3WKAhCSU5zPSCaTu7m+1+DC7Q4/1DTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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