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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c064fc4c7465cbf87a9fc46b2cd8d7a2cb76d8d222f9739b9febd096e75b9a8a' 
  AND token = 'qnyqLi8fNtVpSi1JBCbvWsM6qOpcUeeqD0W0S6/Gz2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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