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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc6524336d3cd973e8998448e096a628b65c92f1ef4d3912b3d85fb13248584' 
  AND token = '7QTV1xbuMon3Fv+AKQ7B3SUugoT3ybLU2B9dX+E0Ft4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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