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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2557999647b7307f920c5c11381e36aa0469c46952b63c853a0a7ec6f028629d' 
  AND token = 'qzIvO5NeirOYntgrKn11ttX/1MclJZkXHseQHEoVq7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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