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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f87476e1eb03293ec006a9bb4c82dcb6b34ddf0e47b8a3dd7e35ff35a28728' 
  AND token = 'ijuQFZo84L2sVGGkS2WKznyctl6w7FjqVm7SzHs79tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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