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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9df7169ad34e673eb6d202b1a3c7dfac89ba41349d6534854d1a218f0c602a' 
  AND token = '5oAvHYwaLtBP1AarUXjAYxAHzUNExG0GdebQx7RILyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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