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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d45f7de7b7c00e8d8ef2c0b64f6c2e09aac09cc3a64b1e826f1188cb597eb47' 
  AND token = 'v8Lhahr8Duz3WprZToKsWx8+WLaHUJjbUTRgUUyMoH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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