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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8489d1fc830d12f1477860d9573b8a0ad99422944c24d3165d2d6ab9cdfb22e3' 
  AND token = 'O8CltVhHxZcb2UulV7v8hHl3aa+ZZ51lldxIRhqygtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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