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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1887ce1c95a478e8d7c2ac2959c44c92bd5bbd52b8a85ef19433e621b6b11964' 
  AND token = 'iGwXcHyqyZ4M1WEK01bmeRWA2U0c9nCqzqnjZwiBDAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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