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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0380e078ce456bd75db18272f7fa909a4c2dcf99d37dce0a04c0fdcb9dd94b' 
  AND token = 'PS4/S+8/YJG8UuDzP4lcbIXQ9UnHv0aUV6i/Wanq9pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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