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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bebe37778f1a7d34c1d4a35560cbc65b0f3fa7ea1f0f92ae00a6b7ae188f79c' 
  AND token = 'lUyPCdhf00gyVi8oRZCjEqKmj1aU6VRC4l2Arpl9kvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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