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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f62a23efb02ba604c84010ebc9a6ecb1d404889c3c0cdacdf59ea10a969865' 
  AND token = '/EWxuU6DTQ/OtlT2p3hJa5N+Ri/ZTFh+yquOe8nKOPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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