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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f68e02873d8b2e4d02d7632a1e92283d82dad4a6e21b1c6f91afa1f5c1b41f0' 
  AND token = 'mmYBc01icg6MsIR0ovw7dk0wDgf0iNP8JKlor39avyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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