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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8595d2704bd6347a955d47b7114f1ed495ef11a326db7b0e8d8c0fdc823830e6' 
  AND token = '9nOVD0Qze0ezVu/DDCzti/CceczCD9T8TrOwWkAEqUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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