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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6f7d86483da44c7f905ff37a575ae381aa719f7a4787af1a5c0e0f538f7ffe' 
  AND token = 'qPP4CGo8Sp4vogB8WFL3tJp1xq7iGSq6Fjvqx14nShs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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