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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3ebaf3f3fbf3e2c3e70a946560a9397483c3c05e3b339019ab1d4d10d5dca2' 
  AND token = 'mS0BbTOhI59PHnggdUmlAQGXITDRDzz3ZpUfTE65pqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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