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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e32524637a20fb0d40643f28fd22a625709b56cb47341ee152cfe99c49de68a' 
  AND token = 'cdv5hTpqkDmrGAdVHP/SF5PTvHiXXtr6SN1uuPn0UUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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