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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ac3f34f53d64ec70582db2cc5f80d6885ec69847ca6b6e3a1bc156a172e33c' 
  AND token = 'Vs+IumAxem8muNRse0915T7Dcf33UFyO38eLXwqDGtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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