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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0200a866ee560f847eda284cd46c1af8ed8d566b33932be8f6821940949700c5' 
  AND token = '2Aj2TkJh9l/L210FnC8gUSO+CA0Z5VezJQNUsCSdd1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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