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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea69c7d30a34edb6411f26b23dbd3ebfe5ae463fa545a1a7c9f9480dfe22324' 
  AND token = 'HEb3sYt01uTHYxPvkAiu/wR3slvAZ75Va5wzpnw5jv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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