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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b69833ba462e3188f048a4e8281a7a2ea8a1165732d7c64e4427fd7b5dc2ec1' 
  AND token = '9hcHYABq93MX3awSdKOrY8Intnt7Ydrcoeqx9SWxEeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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