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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499e82d48ccaaee748cdb1e563f82d458ce29299aa1b4dd874921ac7235c332c' 
  AND token = 'AM3EYw3EeREnoSlV0Rk205aeUcrwNo3l1yCQPY7HD2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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