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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73860543bc998668f29d4bc1af77a4db932d1f445f9d0ae4211fb69887e5291c' 
  AND token = 'cglacaFa3w8kUuLlDDjoMzGuW0ZbbMwKFTW5Nv1Ia1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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