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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3667e668507ac9b45ad2ed784a86804951a6907e7e5f2e84bfe4d23b9612d2a1' 
  AND token = '5hXkeCCXYwaTQenkir3lcP8VkcSY/drOaNb4KZjDIUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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