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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5798eeb573dd6ae2c90c0d1a85abe5b8ae64b30105682c796d5a92dbbaf6ed' 
  AND token = 'zMLcJ55BHLCK++g3a5pHulV227P9cajAKU9KlPF65K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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