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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3dbbc4e2478d73b73f531bb1dc47811fd749c05852cd3c2a7fcd6d4547f4038' 
  AND token = 'EYFEmRFB6Frmb/QE5nliuGkdPcDw1JF3+kOr+7zPHjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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