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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e65bad7b5a180d6a434087a82e77a92a4167e45b2991a95a87590ed90b41d1' 
  AND token = '7ib82pnLIWnPi5QARnLtaviqWC0bjDpFPwS4/OrH0ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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