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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca284571f1a31579e1bc27019be3213e94ac37cc660dd9edab3c9994bb75cc2' 
  AND token = 'aNEds0Kc6qhZJIKzHMhTlQm26kipq7FPbmKERWCHKhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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