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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47d0594f66a369c631b9f2a1b1913c3e51450fd17444db210da8b60fec2e2c1' 
  AND token = 'HFnjwT/2NyDEDZN37stlrm6sq/JZCrk9wXeqqqy2w2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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