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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babcfcbd7cc7f1464cc29c17a9307f90e840d13f3440fc09ae8bc1e467fa9b05' 
  AND token = 'wmyyON4tguyRCf7UtQo2Lz55RHDMqSKJLNyb4U2xLik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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