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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b58272723d3049a50de36a3d73658e4cd1c30ef293e0ccfa1543612b0ffdf7' 
  AND token = 'qHoOvDLecJIyuXEs/Ny9/HqdHnG+D+y332T8l7yJ3Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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