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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b144b0e954e4c93db2d380d3d0d25098a772edc3d8b604632f5a4305f843201c' 
  AND token = 'hrLbK6YAHN+LuQIT6zzEzxRhdN1GoS8gt1EueGkCYGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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