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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e69038e8de7b9684ff515a773fd70d0ca0ebc12d849f7f3f73420b04b97d3fb' 
  AND token = 'iUZhzgfR1REbE0xMDRAekJL/jr5kgWxc1ecE9MtzIa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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