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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c6012019cb42c3df96ad12158f9124f7ad038e56b6a22ee5b67db83e9eedee' 
  AND token = 'anbbNMCXV/GO51Od3+4MiKtxvqnL/xt0Us4JqRhD1B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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