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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d76039c9377426ba7e531dbad12dcdbaf874dd07288cd8eea8de9da026cd750' 
  AND token = 'GUX6QKQKvuy873JSLqhmvCAI7Kb/y+a/VlEKuc2lVlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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