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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0aad108f3987300ffaae16918b0eebcedab6685b7b637e27039e97385bc0af' 
  AND token = '5MZjSUdA6rY5P2e0XyKqqPwQCHvaXO3XjaL29JGs6BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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