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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90df8242c0a3fa08ed0e7c379b7087658917d5bf84feb74bb9a34ef69dac08e5' 
  AND token = 'PKPr54P61MIh22SEJRefP7sUmfHBym6i2f2DT2LqSAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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