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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657fb2fcb42f66fa6172184e7319930a4607230c546ac288b05b670c11e62e80' 
  AND token = 'JOmsDIMHB4EnJfKknhTgYHKmJ84mQinKmO2hGXwaPhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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