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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699773c7cea5cefda56ac47401e49586ceb014e00f6cb9db163f8115950e90fa' 
  AND token = 'KTahZ5COny/KxY3YdocBPnMUEgAj7w4KmNEbF68G5bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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