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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbd40cce6cf3b6accb7e5b9867f4437f85f8d1b8cc8f39b280b236323b4c59a' 
  AND token = 'TSCFWEKi6agXuK3mBpv0QDjMCUD7iZpOQJiFbjcEZpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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