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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d047f604ab3a8d2dc1fc5142f3c5caa9d284bfbd8a3c0d17bbf0ffaaff73a8' 
  AND token = 'Y09+b41sjop0fBGFkHbvEfSkBmWOGjE3n8tE4icnX3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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